weird misfire!!!

[SkevosEP91]

Hi guys and greetings from Cyprus!!!

I come up with this problem within these few days and don't really know what to check or what is the cause ...

My Ep91 Glanza V when i am trying to hit boost on every gear it starts to misfire.. This weird misfires come with a weird jump on the rev counter..

For example when i am at 4500 rpm and builts boost suddenly the rev counter jumps at 6000 rpm or 7500 rpm and it starts misfire...

Also this happens in daylight BUT at nights it boosts normally as it should and that's why it drives me crazy.

I changed distributor and re-gap the spark plugs.

If any one has any idea or had any experience with the same problem or anything similar please help because we are in the middle of tuning and i don't want to push the engine further without knowing what malfunctions.

Also the car runs a standalone Adaptronic e420c but is with the factory ignition system with just an MSD coil and aftermarket Spark leads..

Thanks in advance , any help or opinion would be accepted and respected!!!

[Tommyk]

I had same problem mate and I had left a earth loose on my inlet mani haha. Did it all the time tho not just in day time but sounds like a earth to me mate apart from only does it in day time

[SkevosEP91]

thanks mate it didn't came in my mind i will check them ...

[DRiiFTiE]

thanks mate it didn't came in my mind i will check them ...

Having same problem, yesterday i replaced all the Ignition, Spark Plugs, HT Leads, Coilpack, Distubutor cap & RotorArm Cap, YET im still having problems!

Im going to try Fuel Pump & look for any loose wires next!

let me know how you get on!